An mkswap on it fixed the situation. I have no idea how this happened - I assume the partition must have gotten corrupted somehow, so this bug can be closed.
** Changed in: linux-source-2.6.15 (Ubuntu) Status: Unconfirmed => Rejected ** Changed in: linux-source-2.6.15 (Ubuntu) Status: Rejected => Unconfirmed -- Thinkpad R51 won't hibernate https://launchpad.net/bugs/54382 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs